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arXiv 2103.14788astro-ph.COgr-qchep-ph
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用最新宇宙学数据约束粘性暗能量模型

Constraining viscous dark energy models with the latest cosmological data

Deng Wang, Yang-Jie Yan, Xin-He Meng

摘要:

基于具有体粘滞性的暗能量在宇宙中均匀各向同性渗透的假设,提出了三种新的粘性暗能量(VDE)模型来描述加速宇宙.用最新的宇宙学观测约束这三个模型,发现它们与标准宇宙学模型的偏差很小,可以有效地缓解当前哈勃空间望远镜局部观测与普朗克卫星全球观测之间的$H_0$紧张关系。有趣的是,我们的结论是,在我们的VDE模型中,宇宙曲率仍然是一个空间平坦的宇宙,并且标度不变的原始功率谱至少在$5.5σ$置信水平上被强烈排除在Planck结果之外.我们还给出了三种VDE场景中典型体积粘度参数$η$的$95\%$上限。

英文摘要:

Based on the assumption that the dark energy possessing bulk viscosity is homogenously and isotropically permeated in the universe, we propose three new viscous dark energy (VDE) models to characterize the accelerating universe. By constraining these three models with the latest cosmological observations, we find that they just deviate very slightly from the standard cosmological model and can alleviate effectively the current $H_0$ tension between the local observation by the Hubble Space Telescope and the global measurement by the Planck Satellite. Interestingly, we conclude that a spatially flat universe in our VDE model with cosmic curvature is still supported by current data, and the scale invariant primordial power spectrum is strongly excluded at least at the $5.5σ$ confidence level in three VDE models as the Planck result. We also give the $95\%$ upper limits of the typical bulk viscosity parameter $η$ in three VDE scenarios.

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